Sony MB-806A Service Manual page 21

3-867-236-31 (1)
UHF Synthesized
Tuner Unit
Operating Instructions
WRU-806A
© 1999 by Sony Corporation Printed in Japan [AU66]
Specifications
Tuner
Reception type 110KF3E
Circuit system Dual conversion superheterodyne
Reception frequencies 792.250 to 805.500 MHz
Local oscillators Crystal controlled PLL synthesizer
60 dB or more (at ±250 kHz detuned)
Selectivity
Spurious rejection ratio 70 dB or more
Image rejection ratio 60 dB or more
Muting level 30 dBµ 1)
100 to 15,000 Hz ± 3 dB
Frequency response
50 µ sec
De-emphasis
Signal-to-noise ratio 40 dB or more at an A-weighted RF input level of
20 dBµ
60 dB or more at an A-weighted RF input level of
60 dBµ (±5 kHz deviation at 1 kHz modulation)
Distortion 1% or less (±40 kHz deviation at 1 kHz modulation)
Tone signal frequency 32.768 kHz
2)
Output level –28 dBu (±5 kHz deviation at 1 kHz modulation)
Output connector Multi-connector (10-pin)
1) 0 dBµ=1 µV
2) 0 dBu=0.775 Vrms (unloaded)
General
Power requirements 9 V DC
Current consumption Approx. 225 mA
Operating temperature 0 to 40°C (32 to 104°F)
Storage temperature –20 to +55°C (–4 to +131°F)
57 × 26 × 122 mm
Dimensions
× 1 × 4
1 1 7
(2 / / / inches) (w/h/d)
4 16 8
Mass Approx. 160 g (5.7 oz)
Accessories supplied Operating Instructions (1)
Design and specifications are subject to change without notice.
Overview
The WRU-806A is a reliable UHF synthesized tuner unit for the 800-
MHz-band Sony UHF wireless microphone system which uses the
frequency bands allocated for UHF TV broadcasting. To use this unit,
install it in a Sony MB-806A Tuner Base Unit.
The unit is designed to enable simultaneous use of multiple channels
when channels are selected according to the Sony channel plan.
The following are the principal features of this unit.
Phase Locked Loop (PLL) synthesized system
The unit has a refined phase locked loop (PLL) synthesizer circuit and
covers two UHF TV channels. It operates on 102 channels over a 14-
MHz frequency.
Preprogrammed wireless channel plan for simultaneous
multichannel operation
The unit has many preprogrammed, easily settable channels in a
simultaneous multichannel operation. One group allows setting of 102
channels. The unit also has 12 preset groups of channels, each of
which permits simultaneous operation of 5, 6, 8, 9 or 12 channels
without the effects of intermodulation.
Versatile display
A liquid-crystal display provides a variety of information, including
the levels of the reception channels, RF information and transmitter
battery condition.
Space diversity reception system
The unit provides stable signal reception with minimum dropout.
Tone squelch circuit for noise elimination
A built-in squelch circuit eliminates noise and signal interference
when the unit is in signal reception standby mode.
Compander system
A compander (compressor/expander) system enables stabilized
wireless transmission over a wide dynamic range.
System Configuration
The unit can be used with a UHF Synthesized Wireless Microphone or
UHF Synthesized Transmitter among the models listed in the table
below.
Sony 800 MHz band system models
Frequency band Model name
TV channel Frequency Transmitter or Tuner
(MHz) microphone
66 792.250 to WRT-805A (66) WRR-805A (66)
798.500 WRT-807A (66) WRR-802A (66)
WRT-810A (66) MB-806A with
WRT-820A (66) WRU-806A (66)
799.250 to
67
WRT-822A (66) WRR-810A (66)
805.500
WRT-830A (66) WRR-820A (66)
WRT-860A (66) WRR-840A (66)
WRT-867A (66) WRR-850A (66)
WRR-855A (66)
WRR-860A (66)
A
MB-806A
1
2
B
Lever
Base side of
MB-806A
Lever
Error Message
Apart from the normal indications, the following error messages may
appear on the display.
Message Meaning Measures
Err 01 An error has occurred in The memory data is initialized.
the backup memory Reset the group and channel
data. settings.
Err 02 The PLL-synthesized Contact your nearest Sony
circuit has a malfunction. dealer.
NO TONE As no tone signal is Make sure that the transmitter is
available or a tone signal turned on. If it is, then the
other than 32.768 kHz is problem lies in the transmitter's
being received, the audio tone signal generator or the
signal output is muted. tuner's tone squelch circuit.
Contact your nearest Sony
dealer. If you are using a WRT-
810A wireless microphone, a
"NO TONE" message appears
when you turn off the AF switch,
but this is normal.
Installing in the MB-806A
Up to six WRU-806A units can be installed in the MB-806A.
For information about operating this unit, refer to the Operating
Instructions for the MB-806A.
Installation (See fig. A.)
Notes
• Be sure to power off the MB-806A before installing this unit.
• The buttons and display of this unit may be damaged if they are
gripped too strongly. Always hold this unit by the side.
• Do not touch the connectors on the rear panel of this unit.
• Be careful of static electricity.
1
Hold this unit by the side and insert into the slot. Push in until
you hear a click.
2
To install two or more units, detach the necessary number of
blank panels by pushing in the top and bottom tabs of each panel
and pulling the panel out. Then do step 1 for each unit.
Removal (See fig. B.)
On the base side of the MB-806A, locate the lever corresponding to
the slot where the unit is installed and pull the lever forward. The unit
is ejected from the slot.
Precautions
On operation
• The unit must be used within a temperature range of 0°C to 40°C
(32°F to 104°F). Avoid using the unit for extended periods at
extremely high temperatures or placing it in direct sunlight,
especially outdoors because this may damage the finish of the case.
Never install the unit on or near a heat source, such as lighting
equipment or power amplifiers.
• To avoid using in very humid or dusty places, because such use may
shorten the life of the unit.
• To avoid degradation of the signal-to-noise ratio, do not use the unit
in noisy places or in locations subject to noise or vibration, such as
the following:
— near electrical equipment, such as motors, transformers or
dimmers
— near air conditioning equipment or places subject to direct air
flow from an air conditioner
— near public address loudspeakers
— where adjacent equipment might knock against the unit
• Switching lights on or off may produce electrical interference over
the entire frequency range. Position the unit and the wireless
microphones so that interference is minimized.
• The unit is precisely adjusted at the factory and no adjustment before
use is necessary. Do not touch the inside of the unit or try to repair it
by yourself.
On cleaning
Clean the unit with a dry, soft cloth. Never use thinner, benzene,
alcohol or any other chemicals, since these may damage the finish.